Re: NetBSD 10.1 VPS became unresponsive

[Christof Meerwald <cmeerw%cmeerw.org@localhost>]

On Tue, Apr 08, 2025 at 12:30:42PM -0400, Greg Troxel wrote:
> Christof Meerwald <cmeerw%cmeerw.org@localhost> writes:
> 
> > On Tue, Apr 08, 2025 at 12:14:19PM -0400, Greg Troxel wrote:
> >> Christof Meerwald <cmeerw%cmeerw.org@localhost> writes:
> >> 
> >> > I know there is not much information there, but does anyone have an
> >> > idea where I should start looking?
> >> 
> >> You could describe the system.  You left out the CPU architecture, the
> >> virtualization technology, and the hosting provider.
> >
> > Sure, it's a "AMD Ryzen 9 7950X 16-Core Processor" (2 cores assigned
> > to the VPS, 4 GB RAM), hosting provider is linveo.com, and they are
> > using VirtFusion.
> >
> > NetBSD linveo.cmeerw.net 10.1 NetBSD 10.1 (GENERIC) #0: Mon Dec 16 13:08:11 UTC 2024  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
> 
> I have no idea what VirtFusion is.   Overall, it feels like a missed
> interrupt, that is recovered by the console access.   I suspect you'll
> need to work with linveo to debug.

VirtFusion is based on Linux KVM.

I am not sure about a missed interrupt (or even anything kernel
related) - wouldn't that also affect pings and TCP connections?

To me it would feel more like maybe syslogd blocking on something
(which might then also block anything trying to log something via
syslog)?

In any case, any idea how to debug this? For now I have attached
ktruss to syslogd, but I am not sure how often I might see this issue.


Christof

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